TY JOUR TI CLASSIFICATION OF MALWARE KW information security KW malware KW computer virus KW DOS attacks KW threats KW classification KW feature of malware KW trojan KW worms KW polymorphic viruses JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Eremenko, S.P. AU Sapelkin, A.I. AU Khitov, S.B. PY 2016 IS 2016 PB Saint-Petersburg University of State Fire Service of Emercom of Russia